安庆铜矿深部开采-400m隔离矿柱稳定性分析

Stability analysis of-400 m level insulating pillar of deep excavation in Anqing copper mine

采用拉格朗日非线性程序,数值模拟计算与分析了安庆铜矿l#矿体-400 m水平隔离矿柱在深部矿体开采过程中的力学效应显现规律.研究结果表明:隔离矿柱在上部矿体开采后,因覆盖岩体卸载产生了应力释放,呈现"凸起"垂直位移变形;在深部厚大矿体开采扰动下,隔离矿柱局部区域应力集中,部分区域发生塑性变形,呈现应力拉力拱现象,产生下向变形位移,与矿山常规位移变形监测结果近似.综合分析,隔离矿柱在深部矿体开采过程中整体稳定性良好.

This paper studies the stability analysis of -400 m level insulating pillar of deep excavation of 1^# orebody of Anqing Copper Mine with FLAC3D.The results verify that the strain effect diminishes and bump vertical displacement deformation changes in the insulating pillar for the unloading of upper ore-body mining. Due to disturbance of large and thick in-depth mining, stress concentration and parts of the plastic deformation are formed. Tension arch and downward displacement deformation change in the insulating pillar. The displacement deformation approximates conventional displacement deformation monitoring results of the insulating pillar. The overall stability of the insulating pillar in deep mining is good.